Dental combination-tool.



No. 647,557. Patehted Apr. l7, moo.

n. L. CRUTTENDEN.

DENTAL COMBINAIION TOOL.

(Application filed Nov. 3, 1899.)

UNITE ST TES PATENT OFFICE.

HENRY L. CRUTTENDEN, OF NORTHFIELD, MINNESOTA.

DENTAL COMBINATION TOOL.

SPECIFICATION forming part of Letters Patent No. 647,557, dated April17, 1900.

Application filed November 3, 1899. Serial No. 735,705. (No model.)

To (all whom it may concern.-

Be it known that I, HENRY L. CRUTTENDEN, a citizen of the United States,residing at .Northfield, in the county of Rice and State of Minnesota,have invented certain new and usefullmprovements in Dental Combination-Tools; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin -the art to which it appertains to make and use the same.

My invention has for its object to provide an improved cement-injectorwith cleaning tool or attachment, the device being in the nature of acombination dental tool adapted for use by dentists; and to this end myinvention consists in the novel devices and com binations of deviceshereinafter described, and defined in the claims.

The device is capable of many uses in dental work, but is especiallyadapted for use in the process of crowning teeth. As is wellknown, incrowning teeth after the tooth has been cut oif to leave the proper stuba small hole is drilled deep into the same to receive the smallanchor-stem of the crown. Cement must first be forced to the bottom ofthe small and deeply-drilled anchor-hole in the tooth stump or root, andthis has been found to be exceedingly difilcult and often impossible toaccomplish within the short space of time required for the cement toset.

The device which I- have provided by my invention was intended toaccomplish the.

proper filling of the deep anchor hole or bore in the tooth withrapidity and certainty, and it has been found to fully andsatisfactorily accomplish the purpose for which it was intended.

The device is illustrated in the accompanying drawings,'wherein likecharacters indicate like parts throughout the several views.

Figure l is a plan view of the cylinder and piston members of theinjector, the parts being separated. Fig. 2 shows the said cylinder andpiston members put together, the former being shown in centrallongitudinal section and the latter in full plan. Fig. 3 is a verticalsection taken through the cylinder member on the line 00 m of Fig. 1.Fig. 4 is der member.

and partly in longitudinal section, showing the cylinder member with thecleaning-tool ordrill inserted into the same. Fig. 6 is a plan view withsome parts broken away, showlng the said cleaning-tool or drill, aremovable part thereof being separated therefrom; and Fig. 7 is a sideelevation of the said drill or cleaning-tool with some parts broken awayand others shown in section.

The numeral 1 indicates the cylinder member or cement-tube, which isprovided at its discharging end with a contracted nipple or point 2,having a small passage 3 opening therethrough. At the other end thecylinder is open and is preferably provided with oppositely-projectedbars or finger-pieces 4. Below its upper end and in one side the cylinder-tube 1 is provided with'an opening 5, through which the cement maybepassed into the interior of the cylinder or tube.

The numeral 6 indicates the piston member of the injector, the samebeing in the form of a rod or plunger which closely fits the bore of thecylinder or tube 1 and is provided at its outer end with a head orenlargement 7, by means of which it may be manipulated.

To fill the cylinder or tube 1 with cement, it is not necessary toentirely withdraw the piston or plunger 6 therefrom, but is onlynecessary to withdraw the same far enough to expose the opening 5.Cement having been placed in the cylinder or tube, as indicated, it maybe ejected under high pressure and in a small stream through theperforation 3 of the nipple 2.

To fill the cavityor deep perforation in the tooth root or stump whichis prepared for the application of the cap, the point of the nipple 2 isplaced in the said perforation and the cement is forced to the bottom ofthe same by the inward movement of the plunger or piston 6. This actionis very quickly accomplished and the small and deep cavity orperforationis with certainty completely filled.

As the cement hardens very quickly it is very desirable and reallynecessary to have an efiicient device for thoroughly cleaning out thecylinder or tube 1. For this purpose I provide a drill 8, which closelyfits the interior or bore of the said tube or cylinder. At its outer endsaid drill is provided with a head 9, which, as shown, is removably se-'cured to the drill by a set-screw 10. The drill-head 9 is provided witha projecting stud or pin 11, and in its opposite side is provided with asocket 12, having a small axially-extended perforation 13. 14 indicatesa small shaft or finger-piece, the inner end of which is adapted toclosely fit into the socket 12 and is provided with a small projectingdrill 15, which fits into the perforation or seat extension 13. When thedrill 15 and its fingerpiece 14 are in working position, as shown inFig. 5, the said part 14 projects opposite to the stud or pin 11 andcooperates therewith to afford a good handle, by means of which thedrill 8 may be turned. When the drill 15 and its finger-piece 14 areremoved from the head 9, the said drill is adapted for use to bore outor clearasmall discharge-passage 3 in the nipple or discharge-teat 0fthe tube or cylinder 1. As is evident, by the use of the drill the tubeor cylinder 1 may be completely cleaned, even though the cement may havehardened therein. The cement is very liable to harden within the saidtube or cylinder, for the reason that the dentist will not find time toclean the same until after he has completed the job of crowning thetooth.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows: 1. In a dental tool, the combination with thecylinder or tube 1 with contracted discharge end 2 and lateral opening 5near its larger end, of the piston or plunger working Within saidcylinder, substantially as described.

. 2. In a dental tool the combination with the cylinder or tube 1 withcontracted discharge end 2, lateral opening 5 and projections 4, of thepiston or plunger 6 closely fitting and working within said cylinder ortube, and provided with an enlarged head 7, substantially as described.

3. In a dental tool the combination With a cylinder or tube of acement-injector, of a drill closely fitting the interior of same forcleaning it, substantially as described.

4. In a'dental tool the combination with the cylinder or tube 1 withcontracted discharge end 2, of the cleaning-tool comprising the drill Sfitting the interior or bore of said cylinder or tube and provided withthe removable drill 14, 15, for cleaning the passage through saiddischarge end 2, substantially as described.

In testimony whereof I affix my signature

